<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>for语句</title>
        <script>
            //1-100求和
            var sum=0;

            for(var i=1;i<=100;i++){
                sum+=i;
            }
            alert(sum);
        </script>
    </head>
    <body>
        
    </body>
</html>